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Flowmaster American Thunder Axle-Back Exhaust (15-18 EcoBoost)

Market Price $718.99 You Save 13% ($94.02)
Our Price

$624.97

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  • Item 384451A
  • MPN# 817748

In Stock Ships same business day. Choose options to add to cart

Features, Video & Details

  • Aggressive Flowmaster Sound
  • Durable 409 Stainless Steel Construction
  • Mandrel-Bent Tubing
  • Polished 304 Stainless Steel 4" Tips
  • Includes a pair of Flowmaster Super 10 Series Mufflers
  • Compatible with Fastback & Convertible
  • Fits All 2015-2018 EcoBoost Mustangs

Review & Installation Video

Review & Install Video

Signature Flowmaster Sound. Add the unmistakable Flowmaster sound to your S550 EcoBoost Mustang with an American Thunder Series Axle-Back Exhaust system from AmericanMuscle. The Flowmaster American Thunder Axle-Back Exhaust with its mandrel-bent tubing will greatly improve your Mustang's exhaust flow for an increase in power, and the included baffled mufflers will improve your exhausts sound for an aggressive muscle car exhaust note.

Stainless Steel Construction. Constructed from durable 16 gauge 409 stainless steel tubing for its corrosion resistant properties, the Flowmaster American Thunder Axle-Back features Super 10 Series mufflers with massive 4.0" diameter polished stainless steel tips for impressive muscle car looks and sound. As an added bonus, the tips are embossed with the "Flowmaster" logo for true custom styling.

Cut & Clamp Installation. The installation of this Axle-Back Exhaust requires cutting and removing the stock muffler assemblies and clamping the new muffler assemblies in place. Clamps and instructions are provided.

Application. This Flowmaster American Thunder Axle-Back Exhaust system is designed to fit the 2015-2018 EcoBoost Mustangs, including both fastback and convertible models.

Fitment: 2015 2016 2017 Details

What's in the Box
  • (1) Left Muffler Assembly
  • (1) Right Muffler Assembly
  • (2) 2-1/4" Clamps
Installation Info
Tech Specs
Axle-Back Exhaust Specifications
Piping Material: 409 Stainless Steel Tip Material : Polished 304 Stainless Steel
Piping Size:  3.0" Tip Size: 4.0"
Muffler Type: Baffled Fitment: 2015-2017 EcoBoost
Will it fit my Mustang?
  • EcoBoost - 15, 16, 17

Most Helpful Reviews

5/5
Well worth the price

I was having a hard time choosing which axle back to get for my stang. Since most were pretty similar price wise, I went to YouTube to check some reviews and I fell in love with the sound. My biggest gripe ...

Read More
Helpful (3)

5/5
Great Deep Sound

These sound great and they are not obnoxious. Ford should have added performance exhaust as options. My old Fox body 5.0 was very loud and I loved it in my 20's. I wanted my ecoboost to have a nice exhaust ...

Read More
Helpful (1)

Overall Rating 4.8 out of 5 stars
Read All 5 Reviews

Customer Photos (1) Submit Your Photo

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2 Questions / 2 Answers

Ask a Question

I currently have the flowmaster outlaw on my 2016 v6 but would like to get this one instead. Would I just be able to install it without any further cutting?

Esteban

  • The Flowmaster American Thunder Axle-Back Exhaust can be installed as a direct replacement for the Flowmaster Outlaw Axleback Exhaust.

    Rob D

Helpful (1)

I thought that the Super 10's were one of Flowmaster's loudest products... But this says that it offers a moderate tone. Is it loud or moderate?

DanielF

  • This system is rather loud. Volume is a bit subjective so we would recommend listening to some sound clips online. Most people find the American Thunder kit to be loud and aggressive.

    NoahG

Helpful (0)

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Customer Reviews (5) Write a Review

Overall Rating 4.8

out of 5 stars

Installation Time:Full Day

Installation Cost:0-$100

  • Loudness / Volume 4.6 4.6
  • Exhaust Note 4.8 4.8
  • Fit & Finish 5 5
  • Bang For Your Buck 4.8 4.8



  • 5/5

    Installation Time: Less than 1 Hour

    June 12, 2017

    Review from Flowmaster American Thunder Axle-Back Exhaust (15-17 V6)

    Well worth the price

    I was having a hard time choosing which axle back to get for my stang. Since most were pretty similar price wise, I went to YouTube to check some reviews and I fell in love with the sound. My biggest gripe with the v6 is that it's so quiet. This definitely solved that issue and I've loved every moment with it. It's loud, but not overtly obnoxious, and that is exactly what I wanted. The drone isn't too loud, I personally don't mind it. Other ones seem to have more of a drone/ricer sound, this one gave me the deep sound I was looking for. This was my first modification and I think I'm hooked now

    AnthonyR

    Year: 2015 Submodel: V6

    Helpful (3)

  • 4/5

    Installation Time: Shop Install

    Installation Cost: 0-$100

    May 08, 2017

    Convertible cab loud ...

    I ask my friends if they " want to hear what a real 4 cylinder sounds like ?" They laugh till I start it up and they are surprised it sounds pretty good . Its not an 8 cylinder sound by any means but it's not a rice burner sound either . I didn't want to be overly loud , like I thought the outlaw mufflers would be , because I have a convertible . These American Thunders are Convertible cab Loud . But not to to bad . I had to have something on it because I chose an unleashed Tune for my Turbo 4 and Flowmaster American Thunder axle-backs seemed the best way to let folks know it isn't exactly stock . I'm 62 years young so crawling around under the car is not my thing . I had them installed . Won't wake the neighbors but they will hear ya coming , just not from so far away . Great purchase in my book . If ya have a Vert just be prepared for the interior roar when you spur those ponies on .

    TerryT

    Year: 2015 Submodel: EcoBoost

    Helpful (1)

  • 5/5

    February 23, 2017

    Great Deep Sound

    These sound great and they are not obnoxious. Ford should have added performance exhaust as options. My old Fox body 5.0 was very loud and I loved it in my 20's. I wanted my ecoboost to have a nice exhaust note but not be heard 2 blocks away. They're Awesome and I'm very happy with them!

    LanceB

    Year: 2016 Submodel: EcoBoost

    Helpful (1)

  • 5/5

    September 18, 2016

    great sound

    the flow master american thunder axle-back exhaust it has good sound not noisy

    ahmed2695

    Year: 2015 Submodel: Ecoboost

    Helpful (1)

  • 5/5

    November 20, 2016

    Review from Flowmaster American Thunder Axle-Back Exhaust (15-17 V6)

    Sounds awesome for v6!

    Wow. It's perfect. Loudness is great and the sound is so nice for a v6. Barely any drone too!

    MikeSporty

    Year: 2015 Submodel: V6

    Helpful (0)

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